Well the Asanuma 28mm is easy - it's a Pentax K-mount lens. Any Pentax K to Micro 4/3 mount adapter will work. There are tons of them, starting at a less than $11 on ebay. This FOTGA adapter will suffice and it's cheap - but there are dozens of others that would also work. You could spend more, but not get anything better:

Unfortunately, the Fujinar, which would probably be a quite useful lens to adapt, is the Fujica X-bayonet mount - which is a pretty obscure mount that had small market penetration - and as a result, I don't know of any mount adapters that have been made for this lens mount into Micro 4/3. A search results in no adapters for this lens mount showing up on ebay or Amazon.

What about lens booster, are there any that are recommended? I did notice a few on ebay, but then I noticed they don't have aperture control.
On PK lens, how do you change aperture? I can see aperture ring, but when turned I don't see any aperture blades.

That Fujinon X-mount to Micro 4/3 adapter is a good find. I was not aware that any were available.

The $30 Pentax adapter you found has no additional capability than the $11 one that I linked, when used with that Asanuma lens. You can always adjust the aperture on any Pentax K-mount lens that has an aperture ring (the Asanuma does) with ANY adapter, including the $11 FOTGA adapter I linked originally.

If a lens has an aperture ring, you can always adjust the aperture. with most mounts. Just rotate the ring and watch. One exception is the Canon FD, which has to be mounted on a camera or adapter to turn the ring. I don't know about your Fujinar. If it does turn and the blades move, you should be OK.

What,the blades don't move on your asanuma? Then the diaphragm is likely stuck with oil or crud and you have to use it stuck that way unless you throw it away or fix it.

i took the asanuma apart, and yes there is oil on the blades will clean it tomorrow.

the Fujinar is different, the blades are clean and they move. if you look at the bottom of the lens, on the bottom of the mount you can see silver round post, on the other side of the level there is level, that level needs to be pulled to adjust the aperture to what was selected on the aparture ring. I guess it was designed that way to keep the lens wide open while focusing and metering and when you press the shutter then it activates the aperture.

That lever needs to be pulled to adjust the aperture to what was selected on the aparture ring. I guess it was designed that way to keep the lens wide open while focusing and metering and when you press the shutter then it activates the aperture.

Click to expand...

That's a common method on a lot of mounts. If they designed the adapter properly, there will be a post that holds the lever at the right position. If not, then you can put in something to hold the lever and put some duct tape over it.

Links in this page may be to our affiliates. Sales through affiliate links may benefit this site. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.